SERVER-11077 Debian Enterprise packaging

(cherry picked from commit 82feb98aae3d44b7c6e9a6843ea60d3b49d92692)
SERVER-14023 Add RHEL 7 Enterprise .rpm

(cherry picked from commit 5181c39ebe970ef8053c70e7c283510d8ed2f41a)
SERVER-13243 Add Ubuntu 14.04 Enterprise .deb

(cherry picked from commit 097039445a16436ee0e992b1613c7b0b6b269a2d)
Merge remote-tracking branch 'upstream/v2.6' into v2.6